NBC News reports
The FBI has released video and photos of two "armed and dangerous" suspects in the Boston Marathon bombing and appealed for the public's help in identifying them.
The images show two men in baseball caps. One of them was seen putting down a black backpack at the site of the second blast in Monday's attack. Both were seen walking together through the crowd.
"Somebody out there knows these individuals…though it may be difficult, the nation is counting on those with information to come forward and provide it to us,” Boston FBI Special Agent in Charge Richard DesLauriers said at a Thursday briefing.
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- Anatomy of a bombing: Photos show battery, wires used in device
FBI releases surveillance video taken on the day of the Boston Marathon blasts, which they say shows persons of interest linked to the attack